english

SPORT
1. (countable noun) – an activity that you do for pleasure and that needs physical effort or skill, usually done in a special area and according to fixed rules It can be a game or a contest.
a sport = a particular type of sport. The plural form of sport is sports. (~ more than one activity)

His only sport is tennis.
My favourable sports are rugby and swimming.

2. (uncountable noun) – sport in general (British English)
In America, use sports when you refer to sport in general.

He is not interested in sport. ~ British English
He is not interested in sports. ~ American English

Use “sports” in front of a noun (sports + noun)
school sports day, sports section of a newspaper, sports writer,
sports centre, sports equipment, sports injury, sports bar,
sports betting, a sports car, sports coverage, sports shop... etc.

sports is the term for all kind of sport, like fruit , furniture and stationery.
it includes all so it need "s"

sport is just one
e.g.
my favourite sport is playing football.

sport means just include one item

sports refer to two or three or over three item,such as football,basketball

and table-tennis